DFA - Conical Ceiling Diffuser. Halton DFA. Conical Ceiling Diffuser

Transcription

1 Halton DFA Conical Ceiling Diffuser Horizontal air supply, suitable also for exhaust Installation flush to the ceiling, light-weight aluminium design Circular duct connection with rubber gasket Openable cone module enables cleaning of the diffuser and ductwork. Accessories Balancing plenum with measurement and adjustment functions MATERIAL AND FINISHING PART MATERIAL FINISHING NOTE Frame Aluminium Anodised Polyester-painted/ White RAL 9010/ 50% gloss Vanes Aluminium Anodised Polyester-painted/ White RAL 9010/ 50% gloss Epoxy-painted (100%) available Epoxy-painted (100%) available Perforated plate Galvanised steel 45 % perforation Plenum Galvanised steel 1

2 QUICK SELECTION Pa qv l/s m 3 /h DFA LpA DPst DPtot Ld Lmin - 1,2 2,0 3,6 L0.2 2,0 2,6 3,4 4,8 DFA LpA DPst DPtot Ld - 3,6 4,2 5,0 Lmin 1,0 2,0 3,2 4,8 L0.2 2,8 4,6 5,8 7,8 DFA LpA DPst DPtot Ld 3,8 4,8 5,4 6,2 7,5 Lmin 2,0 4,2 4,8 6,0 8,0 L0.2 7,2 9,2 11,0 12,8 15,4 DFA LpA DPst DPtot Ld 4,0 4,8 5,6 6,4 7,2 Lmin 2,8 3,8 5,0 6,6 8,4 L0.2 8,0 10,0 12,0 14,0 16,6 DFA LpA DPst DPtot Ld 3,2 3,6 4,4 5,6 6,9 Lmin 7,6 9,4 11,6 16,2 20,8 L0.2 8,2 9,6 11,6 15,6 19,4 LpA values presented with room attenuation 4 db (red 10m 2 - sab). When using room attenuation 8 db (red 25m 2 - sab): LpA - 4dB. Pa LpA DPst Supply air cooling capacity, W A-weighted sound pressure level, reduced by total equivalent absorption surface of 10m 2, db(a) red 10m 2 - sab Static pressure drop, Pa DPtot Ld Lmin Total pressure drop, Pa Distance from the supply unit, at which air jet detaches from ceiling, m Minimum distance between central lines of two supply units, m (V3 = 0,25m/s at 1.8m height) L0.2 Isotermal throw length, m when residual velocity of supply air jet 0,2 m/s Room temperature (Tr) = 24 C Supply air temperature (Ta) = 14 C Room height = 2,8 m ACCESSORIES ACCESSORY CODE DESCRIPTION Balancing plenum with airflow measurement and adjustment unit TRI/N For balancing, equalising the airflow Sound attenuation IN Polyester fibre in the TRI plenum Airflow measurement and adjustment unit MSM For supply installation 2

3 Installation CODE DESCRIPTION 1 Front panel 2 Frame 3 Perforated plate The diffuser is connected either directly to the duct or using a TRI balancing plenum. Function Air is supplied horizontally into the space through the slots of the conical front panel. Supply air mixes with room air in the vicinity of the diffuser. The fixed cones of the diffuser are designed to ensure that the supply air flows along the ceiling. The DFA diffuser can also be used as an exhaust unit. Installation with plenum TRI DIMENSIONS ØD NS W W1 H ØD DFA (ØD) ØD1 TRI W2 H TRI TRI TRI TRI TRI W The technical performance for the combination of supply air diffuser and TRI plenum is presented separately for the two different installations. See HIT Design software. W1 ØD Duct installation When the DFA diffuser is installed without a TRI balancing plenum, it is recommended that the diffuser be connected to ductwork using a straight connection duct of minimum length 3xD upstream of the diffuser. H 54 3

4 Adjustment In order to enable airflow adjustment and measurement of airflow rate, it is recommended that the diffuser be connected to the TRI balancing plenum equipped with the MSM module. The supply flow rate is adjusted by using the measurement and adjustment module MSM. Detach the front panel and pass the tubes and control spindle through the diffuser. Measure the differential pressure using a manometer. The flow rate is calculated using the formula below. q v = k * p m Adjust the airflow rate by rotating the control spindle until the desired setting is achieved. Lock the damper position with a screw. Replace the tubes and spindle into the plenum and reattach the front panel. Servicing Remove the front panel (central cones) by gently drawing out the central part. Detach the perforated plate from the supply air section and sleeve. Clean the parts by wiping them with a damp cloth. Push the perforated plate back into place. Push the front panel back into place so that the springs lock. Option: with balancing plenum TRI + MSM Remove the measurement and adjustment module by gently pulling the shaft (not the control spindle). Wipe the parts with a damp cloth, instead of immersing in water. Reassemble the measurement and adjustment module by pushing in the shaft until the module meets the stopper. Push the front panel back into place so that the clips lock. K-factor for installations with different safety distances (D= duct diameter) TRI >8XD min 3XD

5 Pressure drop, throw pattern and sound data DFA-125, DFA-160, DFA DFA , DFA-400 Selection example : Requirements : qv = 80 l/s Selection : DFA-160 LpA < 35 db(a) LpA < 35 db(a) L0,2 < 7 m L0,2 < 6,4 m DPtot = 60 Pa Note: Recommended minimum supply temperature, 10 C below room. For return use, adjust supply data by adding + 2 db(a) and DPtot = DPtot (supply) x 1,5. Throw pattern using different input data (velocity, T) can be seen using the Halton HIT Design program. SOUND LEVEL DATA qv DPst DPtot F (Hz) LpA NR NC (l/s) (m 3 /h) (Pa) (Pa) [db(a)] DFA-125(R4) DFA-160(R4) DFA (R4) DFA (R4) DFA-400(R4) LpA values presented with room attenuation 4 db (red 10m 2 - sab). When using room attenuation 8 db (red 25m 2 - sab): LpA - 4dB. NR/NC noise criteria 5

6 Suggested Specifications The diffuser shall be made of extruded aluminium, anodised or polyester-painted with a white (RAL 9010) standard colour. The bevel angles of the outer frame and central cone shall be welded so that the joints are almost invisible. The diffuser shall have a galvanised steel transition to provide for circular duct connection. The spigot shall have a sealing gasket for airtight duct connection. The diffuser shall be connected to the ductwork using a balancing plenum, which comprises polyester fibre with a washable surface as sound attenuation material. The plenum shall be equipped with an airflow measurement and adjustment module. The front panel of the diffuser shall be detachable in order to provide access to the measurement and adjustment module in the plenum. Product Code DFA-D-A D = Diameter of duct connection 125, 160, 250, 315, 400 A = Diffuser size D=125: 295 D=160: 370 D=250: 450, 520 D=315: 520 D=400: 595 Specifics and accessories FI = Finishing PN Painted AN Anodised CO = Colour W White Code example DFA , FI=PN,CO=W Sub products TRI Plenum (Diffusers) 6